R&D Report 1994-18 : Eureka 147: Tests of the error performance of the DAB system N.H.C. Gilchrist This Report describes tests carried out by the BBC and other members of the Eureka 147 Working Group 2-A, to assess the performance of the DAB (Digital Audio Broadcasting) system with a low carrier-to-noise ratio at the receiver. The tests were conducted using a number of listeners to judge the audio quality, making collaborative decisions with the knowledge of the conditions under which the system was operating at all times. The primary purpose of the work described in this Report was to inform the Eureka 147 project about the failure characteristics of the DAB system as the carrier-to-noise ratio is reduced. Knowledge of the failure characteristics is important, because it enables broadcasters to monitor system performance at a time when services are being planned and when receiver techniques are developing. It should also enable the performance of the Eureka system to be compared with that of other systems.